Color Analysis of TPE Overmolding Materials
Time of issue:2024-10-23
Color Analysis of TPE Overmolding Materials:
Most TPE (Thermoplastic Elastomer) and TPR (Thermoplastic Rubber) materials come in transparent, translucent, or natural white forms, making them easy to color. Suitable color concentrates or colorants should be selected for coloring. Typically, SBC (Styrene Block Copolymer)-based TPE/TPR materials exhibit superior colorability compared to other types of TPE/TPR. They require less color concentrate to achieve the desired color intensity, and the colors tend to be purer and brighter. It's important to note that the viscosity of the color concentrate should be lower than that of the TPE/TPR, since TPE/TPR has a higher melt index, which aids dispersion and ensures uniform color distribution.
1. For SBS (Styrene Butadiene Styrene)-based TPE/TPR, it is best to use polystyrene or EVA (Ethylene-Vinyl Acetate) as the carrier resin for the color concentrate.
2. For harder TPE/TPR materials based on SEBS (Styrene-Ethylene/Butylene-Styrene), polypropylene is recommended as the carrier resin for the color concentrate.
3. For softer TPE/TPR materials based on SEBS, LDPE (Low Density Polyethylene) or EVA are preferable as carrier resins for the color concentrate rather than polypropylene, to avoid affecting the hardness of the compound.
4. PVC (Polyvinyl Chloride)-based color concentrates are not suitable for use with either SBS or SEBS.
5. For certain overmolding applications with TPE/TPR, the use of polyethylene-based color concentrates should be avoided as they might negatively impact the adhesion between the TPE/TPR and the substrate.
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